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Nickel 718 vs. R30605 Cobalt

Nickel 718 belongs to the nickel alloys classification, while R30605 cobalt belongs to the cobalt alloys. They have a modest 31% of their average alloy composition in common, which, by itself, doesn't mean much. There are 25 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is nickel 718 and the bottom bar is R30605 cobalt.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
210
Elongation at Break, % 12 to 50
34
Fatigue Strength, MPa 460 to 760
260 to 590
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 75
81
Tensile Strength: Ultimate (UTS), MPa 930 to 1530
1130 to 1900
Tensile Strength: Yield (Proof), MPa 510 to 1330
470 to 1600

Thermal Properties

Latent Heat of Fusion, J/g 310
290
Melting Completion (Liquidus), °C 1340
1410
Melting Onset (Solidus), °C 1260
1330
Specific Heat Capacity, J/kg-K 450
410
Thermal Conductivity, W/m-K 11
9.6
Thermal Expansion, µm/m-K 13
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.4
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 1.5
1.8

Otherwise Unclassified Properties

Density, g/cm3 8.3
9.6
Embodied Carbon, kg CO2/kg material 13
9.8
Embodied Energy, MJ/kg 190
140
Embodied Water, L/kg 250
450

Common Calculations

Stiffness to Weight: Axial, points 13
12
Stiffness to Weight: Bending, points 23
21
Strength to Weight: Axial, points 31 to 51
33 to 55
Strength to Weight: Bending, points 25 to 35
25 to 36
Thermal Diffusivity, mm2/s 3.0
2.5
Thermal Shock Resistance, points 27 to 44
31 to 52

Alloy Composition

Aluminum (Al), % 0.2 to 0.8
0
Boron (B), % 0 to 0.0060
0
Carbon (C), % 0 to 0.080
0.050 to 0.15
Chromium (Cr), % 17 to 21
19 to 21
Cobalt (Co), % 0 to 1.0
46.4 to 57
Copper (Cu), % 0 to 0.3
0
Iron (Fe), % 11.1 to 24.6
0 to 3.0
Manganese (Mn), % 0 to 0.35
1.0 to 2.0
Molybdenum (Mo), % 2.8 to 3.3
0
Nickel (Ni), % 50 to 55
9.0 to 11
Niobium (Nb), % 4.8 to 5.5
0
Phosphorus (P), % 0 to 0.015
0 to 0.040
Silicon (Si), % 0 to 0.35
0 to 0.4
Sulfur (S), % 0 to 0.015
0 to 0.030
Titanium (Ti), % 0.65 to 1.2
0
Tungsten (W), % 0
14 to 16